On Tuesday, September 15, 2020 at 3:20:13 PM UTC-4 Emmanuel Charpentier
wrote:
> sage: L[1].n()
>
> fails because L1 is an equation, i. e a symbolic expression whose operator
> is the built-in “eq”, which has no n() method.
>
> However,
>
> sage: PP=-625/1000*t^4 + 2355/100*t^3 -
sage: L[1].n()
fails because L1 is an equation, i. e a symbolic expression whose operator
is the built-in “eq”, which has no n() method.
However,
sage: PP=-625/1000*t^4 + 2355/100*t^3 - 264051/1000*t^2 + 10269/10*t - 8538/10
sage: PP.parent()
Symbolic Ring
sage: L=solve(PP,t)
sage:
Thanks! I've already learned more.
What I first did was this:
sage: PP
-0.625*t^4 + 23.55000*t^3 - 264.0510*t^2 +
1026.900*t - 853.8000
sage: L=solve(PP==0,t)
sage: L[1]
t ==
-1/1250*sqrt((390625*(4/1953125*I*sqrt(37468876945450884598)*sqrt(5) -
> I still don't know my way around the Sage documentation... Sorry for the
> elementary question.
>
> Yeah, we are sorry that it never has gotten more organized (though it is
actually quite thorough!). You may want to try the French (now in
English) Sage book, or Greg Bard's AMS (but free
